Great info in these responses.
It has already been said by a few, but I'll add my experience as a Deus user and n00b detectorist in general. It is not a simple turn on and go machine for the first year I'd say. It is now (for me), but I put serious effort and time into learning and studying every bit of info I could find, read the manual about thirty times, Sabisch's book, lots of study and time in field. I feel comfortable with it now, but this is three years later or so. I still am certainly no master with it.
I have wanted a waterproof machine (which you (OP) stated you don't care about) for some time and it is between the Nox and Excal for me currently.
If you don't need to sell one, I would just keep the Nox and the Simplex+ which I believe is what you (OP) said you are thinking of doing in your SImplex+ thread.
I would give that Nox a chance still. I know I had a hard time with the Deus for quite a while, but I am super happy with it now especially when I need to make adjustments (I am often in very different soils and conditions) and I imagine the Nox would be just as useful.
If the Simplex+ ends up being all the machine you could want, then at that point sell the Nox
All that said, I do love the Deus most of the time. It is my only machine and it does most things well. I would love to have a fully waterproof machine as I said, but as an all a-rounder, its pretty awesome, just not simple to use at first. If you need to compensate for varying soils/conditions it is great. If you don't want to dig trash for the first six months of use in parks, study, research and lots of field time. I don't have much of a problem with bottle caps any more, but I dug hundreds of them in the beginning.
I love that the Deus is 0-99, super light and compact for packing, and the completely wireless is awesome if you don't need to get in the water. The shaft is shaped similar to the Simplex+ and had cam locks as well. There are something like six or eight save slots for custom programs which I like on top of the ten stock programs. I run the HF elliptical and a LF 9" coil, but nowadays, you would get either a HF or an X35 which I would love to have.
The XP ORX on the other hand, sounds like it is the XP machine you would want judging by you request for simplicity of use, should you go XP. It sounds, from everything I have researched, to be the Deus, with less adjustability. The Nox 600 to the 800 if you will, but still with the HF if you want it.
I'm no expert, but if any of this is useful to anyone, great.
All the best and HH!